<template>
  <div class="category">
    <h1>当前求和为：{{ sum }}</h1>
    <h2>当前求和十倍为：{{ bigSum }}</h2>
    <h3>我在{{ school }}学习{{ subject }}</h3>
    <select v-model.number="n">
      <option value="1">1</option>
      <option value="2">2</option>
      <option value="3">3</option>
      <option value="4">4</option>
      <option value="5">5</option>
    </select>
    <button @click="increment">+</button>
    <button @click="decrement">-</button>
    <button @click="incrementOdd">当前求和为奇数再加</button>
    <button @click="incrementWait">等一等再加</button>
  </div>
</template>

<script>
import { mapState, mapGetters } from "vuex";
export default {
  name: "CountVue",
  data() {
    return {
      // 用户选择的数据
      n: 1,
    };
  },
  computed: {
    // 自己写计算属性
    /* he() {
      return this.$store.state.sum;
      
    },
    xuexiao() {
      return this.$store.state.school;
    },
    xueke() {
      return this.$store.state.subject;
    }, */
    /* 
        let obj2 = {x:100,y:200}
        let obj={
          a:1,
          b:2,
          ...obj2
          扩展obj
        }
    */
    // 借助mapState生成计算属性,从state映射数据（对象写法）
    // ...mapState({ he: "sum", xuexiao: "school", xueke: "subject" }),

    //************************************************************************ */

    /* sum() {
      return this.$store.state.sum;
    },
    school() {
      return this.$store.state.school;
    },
    subject() {
      return this.$store.state.subject;
    }, */
    // 数组写法，生成的计算属性名和读取出的名要一致
    ...mapState(["sum", "school", "subject"]),

    // ****************************************************************

    /* bigSum() {
      return this.$store.getters.bigSum;
    }, */
    // 借助mapGetters生成计算属性，从getters读取数据，对象、数组写法
    // ...mapGetters({ bigSum: "bigSum" }),
    ...mapGetters(["bigSum"]),
  },
  methods: {
    // commit直接和mutations对话
    // dispatch和actions对话
    increment() {
      this.$store.commit("JIA", this.n);
    },
    decrement() {
      this.$store.commit("JIAN", this.n);
    },
    incrementOdd() {
      this.$store.dispatch("jiaOdd", this.n);
    },
    incrementWait() {
      this.$store.dispatch("jiaWait", this.n);
    },
  },
};
</script>

<style scoped>
button {
  margin-left: 10px;
}
</style>